once a year, he opens his "g and m farms corn maze" east of san francisco -- in the livermore valley wine country -- to hoards of crazed kids and their parents. you're surrounded by eight, ten foot stalks of corn. so you lose your sense of direction very easily. they're having a field day exploring six acres of corn. it's a dead end this maze is only one of hundreds that open across the country each year. this one looks like a quarter, thanks to a corn maze expert who carves out the design months ahead of time. he sets this field into grids by using the rows that we plant on and then he flags it out. gets it all marked. and then he comes in and actually kills the corn with round up when it's about two inches tall. so it's already done basically when this corn is two, three inches out of the ground. they even install a bridge... which later becomes a big hit with the kids. this is cool! wow! how'd they get under there? for those who get hopelessly turned around, help is on hand. dan marciel is a partner in the farm who also plays "corn cop." they're completely lost. they don't know wh